Php - OOP - method_exists function

method_exists: Checks if the class method exists in the given object.

<?php
$directory = new Directory('.');
var_dump(method_exists($directory,'read'));  // return   bool(true)  if function exist

?>

<?php
function foo()
{
$numargs = func_num_args();
echo "Number of arguments: $numargs\n";
}

foo(1, 2, 3);
?>